/// <summary>
/// Adds another polynomial to this
/// </summary>
/// <returns>
/// this polynomial
/// </returns>
/// <param name="other">The polynomial to add</param>
public MyPolynomial Add(MyPolynomial other)
{
double[] result;
bool longer = this.GetDegree() >= other.GetDegree();
if (longer)
{
result = new double[_coeffs.Length];
}
else
{
result = new double[other.GetDegree() + 1];
}
for (int i = 0; i < result.Length; i++)
{
try
{
result[i] = _coeffs[i] += other.CoeffAt(i);
}
catch (IndexOutOfRangeException)
{
if (longer)
{
result[i] = _coeffs[i];
}
else
{
result[i] = other.CoeffAt(i);
}
}
}
_coeffs = result;
return(this);
}
public static String CoeffsToString(MyPolynomial poly)
{
String result = "[";
for (int i = 0; i < poly.GetDegree(); i++)
{
result += poly.CoeffAt(i) + ", ";
}
result += poly.CoeffAt(poly.GetDegree()) + "]: ";
return(result);
}
public static void Main(string[] args)
{
int numberOfTests = 50;
// Test ToString by creating 100 random sets of arrays and
// creating polynomials for each one and printing via
// ToString
Console.WriteLine("\n\nTesting ToString:\n");
Random rnd = new Random();
for (int i = 0; i < numberOfTests; i++)
{
MyPolynomial poly = RandomPolynomial(rnd, -20, 20);
Console.WriteLine("\n" + CoeffsToString(poly));
Console.WriteLine(poly.ToString());
}
// Test evaluate
Console.WriteLine("\n\nTesting evaluating a polynomial");
for (int i = 0; i < numberOfTests; i++)
{
double x = rnd.Next(-10, 10);
MyPolynomial poly2 = RandomPolynomial(rnd, -10, 10);
double result = poly2.Evaluate(x);
Console.WriteLine("\n({0}), {1} = {2}", poly2.ToString(), x, result);
}
// Test adding polynomials
Console.WriteLine("\n\nTesting adding polynomials:\n");
for (int i = 0; i < numberOfTests; i++)
{
MyPolynomial poly5 = RandomPolynomial(rnd, -5, 5);
MyPolynomial poly6 = RandomPolynomial(rnd, -5, 5);
Console.Write("\n({0}) + ({1}) = ", poly5.ToString(), poly6.ToString());
poly5.Add(poly6);
Console.WriteLine(poly5.ToString());
}
// Test multiplying polynomials
Console.WriteLine("\n\nTesting multiplying polynomials:\n");
for (int i = 0; i < numberOfTests; i++)
{
MyPolynomial poly5 = RandomPolynomial(rnd, -5, 5);
MyPolynomial poly6 = RandomPolynomial(rnd, -5, 5);
Console.Write("\n({0}) x ({1}) = ", poly5.ToString(), poly6.ToString());
poly5.Multiply(poly6);
Console.WriteLine(poly5.ToString());
}
}
/// <summary>
/// Multiplies this by another polynomial
/// </summary>
/// <returns>
/// this polynomial
/// </returns>
/// <param name="other">The polynomial to multiply by</param>
public MyPolynomial Multiply(MyPolynomial other)
{
double[] product = new double[_coeffs.Length + other.GetDegree()];
for (int i = 0; i < _coeffs.Length; i++)
{
for (int j = 0; j < other.GetDegree() + 1; j++)
{
product[i + j] += _coeffs[i] * other.CoeffAt(j);
}
}
_coeffs = product;
return(this);
}